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A great combination: The large uniaxial anisotropy of lanthanides and its influence on the local moments and spin-relaxation dynamics at the iron nuclei was probed by using 57Fe Mössbauer spectroscopy and magnetic susceptibility measurements (see picture). The derivation of the anisotropy was possible by comparing isomorphous clusters containing diamagnetic, isotropic, and anisotropic lanthanide ions.
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Akhtar et al. (2009) studied this question.
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